The Omniphone is an absolutely fantastic project that aims to enable everyone to make music! CDM breaks it down well here:
These designs for music therapy collaboration do make new demands to better remove restrictions present on other instruments. That bulbous shape makes the objects playful and encourages touch. Capacitive sensors make it responsive – with light and vibration feedback. The Teensy, a powerful and friendly inexpensive embeddable platform, powers the brains.